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In some senses, backplate is marked as UK. Watch for register when choosing this word.
backplate
noun 5
Definitions
noun
1
A plate protecting a fighting person's back.
The cuirass of Roman muscled type is composed of an anatomically modeled breastplate and backplate, each made in one with a gorget […]
2
A plate harnessed to a diver's back, to which the gas cylinders are attached.
3
The metal plate on the rear of a computer's casing, where the ports are found.
4
A wood or metal (or glass, etc) plate that serves as a backing for an object.
5
A rigid metal plate inside the brake drum, which supports the wheel cylinder, brake shoes, and other parts of a drum brake.
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